A light experiment made of two sources of artificial white light and of some coloured inflatable balloons that can be moved by the visitors. On one side of the room – the “yellow zone” – the white light is produced by a mixture of red, green and blue lights. On the other side – the “yellow-free zone” – the light appears identically white but contains no green and no blue lights, but only red and cyan. Surprisingly, in this zone the yellow objects appear of another colour. A primary yellow becomes bright red-orange, lemon-yellow objects turn pink or beige, yellowish-greens become brown, orange objects are almost purely red.
For human beings having a so-called “normal” colour vision – i.e. about 95% of the entire human population –, when I say “white” for a light, I say that when the light illuminates a white wall, the white wall appears white. YZ / YFZ invites the visitors to experience the almost magical effect of a special white light that counter-intuitively transforms the colours of everyday objects, including on the visitor’s bodies: the colours of their eyes, of their skin and of their clothes.